pthread_mutexattr_getprioceiling.c 1.4 KB

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  1. /* Get priority ceiling setting from pthread_mutexattr_t.
  2. Copyright (C) 2006 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.
  5. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Lesser General Public
  7. License as published by the Free Software Foundation; either
  8. version 2.1 of the License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; if not, see
  15. <http://www.gnu.org/licenses/>. */
  16. #include <pthreadP.h>
  17. int
  18. pthread_mutexattr_getprioceiling (
  19. const pthread_mutexattr_t *attr,
  20. int *prioceiling)
  21. {
  22. const struct pthread_mutexattr *iattr;
  23. int ceiling;
  24. iattr = (const struct pthread_mutexattr *) attr;
  25. ceiling = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
  26. >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT);
  27. if (! ceiling)
  28. {
  29. if (__sched_fifo_min_prio == -1)
  30. __init_sched_fifo_prio ();
  31. if (ceiling < __sched_fifo_min_prio)
  32. ceiling = __sched_fifo_min_prio;
  33. }
  34. *prioceiling = ceiling;
  35. return 0;
  36. }